1243089216 has 84 divisors (see below), whose sum is σ = 3584704032. Its totient is φ = 411849984.

The previous prime is 1243089167. The next prime is 1243089217. The reversal of 1243089216 is 6129803421.

1243089216 is a `hidden beast` number, since 1 + 2 + 430 + 8 + 9 + 216 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243089217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89731 + ... + 102653.

It is an arithmetic number, because the mean of its divisors is an integer number (42675048).

Almost surely, 2^1243089216 is an apocalyptic number.

1243089216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243089216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792352016).

1243089216 is an abundant number, since it is smaller than the sum of its proper divisors (2341614816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243089216 is a wasteful number, since it uses less digits than its factorization.

1243089216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13108 (or 13095 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1243089216 is about 35257.4703573583. The cubic root of 1243089216 is about 1075.2284975971.

The spelling of 1243089216 in words is "one billion, two hundred forty-three million, eighty-nine thousand, two hundred sixteen".